shouldn't be Videos almost identically looking as Music? control elements (play, pause,... ) and the location of those elements. (and maybe the dark vs white color, but that I find personally irrelevant.)

Totem in it's actual stage is very awesome and great of features, just navigating between "properties", "browse" and "playlist" and so on all in sidebar is somehow uncomfortable. Also the playback of a DVD is strange by the menu - but cool by "browse". Also "search" is helping for youtube videos fine, but "browse" is cluttered. So somehow unifing the media access would be required. It is a common problem to figure out how to play a copied DVD folder structure. Your task is hard, but please make it lovely

The ability to browse library while video plays in a mini window would be nice, allowing videos to be queued in playlist.